Arm chair



FIG. 1 is a front perspective view of the arm chair embodying my ornamental design;

FIG. 2 is a side elevation view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a back elevation view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for an arm chair, substantially as shown and described. 